Code Definition

P1172 — Throttle Actuation Potentiometer Sign. 2 Signal Too Low

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Volkswagen

About P1172

P1172 is a manufacturer-specific powertrain diagnostic trouble code recorded for Volkswagen vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1172 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1172 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The electronic throttle body carries two throttle position potentiometers that feed the Engine Control Module (ECM) with independent signals proportional to the angle of the throttle plate, allowing the ECM to verify one against the other. Potentiometer 2 is supplied with a 5V reference and a sensor ground, and its wiper produces a signal voltage that stays within a defined window at all times, never reaching either supply rail even at the mechanical stops. DTC P1172 is set when the ECM sees the potentiometer 2 signal voltage fall below the lowest plausible value, typically under about 0.2V to...

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